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RTU 4 Way Relay Module DIY STM8S103 System 4 Road Input 485 Communication
Product Description
Feature :
4 channel relay output (a normally open, normally closed)
STM8S103F3 microcontroller
4 way optical coupling isolation
4 relay closed the LED light
Circular DC interface, and DC terminal interface.Convenient power connection (5 v or 12 v power supply voltage according to the voltage relay decision)
4 road input interface
All the RS485 communication interface.
A power indicator light
A user LED lights
Reset button
high quality
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